Wear Prediction via Accelerated Test on Chromium Based Hard Coatings for Gas Turbine Interfaces Applications Up to 370 °C

International Conference on Advanced Manufacturing and Industry Applications

机械制造;工业技术

Yunus, S.M.^1 ; Pauzi, A.A.^1 ; Husin, S.^1

TNB Research Sdn Bhd, Selangor, Malaysia^1

关键词: Accelerated tests;    Combustor liners;    Conductivity properties;    Elevated temperature;    Increasing temperatures;    Ni-based superalloys;    Operating temperature;    Wear characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/429/1/012063/pdf
DOI  :  10.1088/1757-899X/429/1/012063

学科分类：工业工程学

来源: IOP

【 摘 要 】

Chromium (Cr) based hard coatings offer excellent wear resistance and thermal conductivity properties. Applying additives, such as carbon (C) and cobalt (Co) may improve hardness thus delay wear. Therefore, Cr-C and Cr-Co based coating systems were selected to investigate their potential on the mating surfaces of Ni-based superalloy combustor liners of commercial gas turbines. One surface contact on the commercial combustor liner was selected, in which was exposed to temperatures of 370 °C during its operation. In this study, the selected hard coatings were deposited onto nickel-based substrates via air plasma. An accelerated wear test was conducted at two different operating temperatures; at 100 °C and 200 °C to predict the wear characteristics at elevated temperatures for longer operation, from 8,000 Operating Hours (OH) to 12,000 OH. Both coatings exhibited a decreased hardness with increasing temperatures. It was found that high severity in volume loss suffered by Cr-Co coatings. In summary, it was quantitatively predicted that Cr-C coated Ni alloy was found to be much better than the Cr-Co based coating to delay the wear in gas turbines thus prolong the operation from 8,000 to 12,000 OH at 370 °C.